Okla. Stat. tit. 58, § 22

Any executor, devisee or legatee named in a will, or any other person interested in the estate, may at any time after the death of the testator, petition the court having jurisdiction to have the will proved, whether the same be in writing, in his possession or not, or is lost or destroyed, or beyond the jurisdiction of the state, or a nuncupative will.